Deep Sky Object in Summer
Hoag's Object (Peculiar Galaxy in Serpens)

Date & Time: Apr 28 2017, from 26:33 to 27:06 JST(+0900)
Composed 10 shots with 3 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080)
Device Size...20×20mm
Sensitivity...ISO6400, White Balance...Daylight

Hoag's Object / Galaxy
R.A.15h 17m 13.7s (2000.0)
Dec.+21° 35' 03" (2000.0)
Apparent Sizeabout 2.0'
Radial Velocity+12740km/s
Magnitudeabout 14
Distance600 million light yrs.
Group of Galaxies-
Other IDsPGC 54559
It's a deep sky object positioned in northern edge of Serpens Caput. You can find out about 6.5 degrees southwest from alpha Coronae Borealis, Alphecca. This picture has captured a small central bulge and very dimmed outer ring-like structure. The Hubble Space Telescope (HST) has taken the object with its ring clearly.
The object has a nickname of gThe Hoag's Objecth from name of discoverer, Art Hoag. The galaxy has a central nucleus including older stars and an outer ring formed from only young stars. And we don't know reason why there is a void region between two structures like a stellar generation gap since discovered year 1950. The galaxy has a diameter of about 100 thousand light years and a distance of 600 millions light years.

Hoag's Object captured by HST Hoag's Object captured by HST

Arp 330

M6 & M7

Copyright(c) 2017 by Naoyuki Kurita, All rights reserved.
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